com.ibm.agletx.util
Class SlaveItinerary

java.lang.Object
  com.ibm.aglet.event.MobilityAdapter
      com.ibm.agletx.util.SeqItinerary
          com.ibm.agletx.util.SlaveItinerary

All Implemented Interfaces:

java.util.EventListener, MobilityListener, java.io.Serializable

public class SlaveItinerary

extends SeqItinerary

An Itinerary class to repeatedly perform a specific task in multiple destinations.
Here is a typical usage of this class.

 private boolean lastTask = false;
 private SlaveItinerary itinerary  = null;
 class TaskA extends Task {
 public void execute(SeqItinerary itin) throws Exception {
 // do some work
 }
 }
 
 class TaskB extends Task {
 public void execute(SeqItinerary itin) throws Exception {
 // do some work
 }
 }
 
 public void onCreation(Object ini) {
 itinerary = new SlaveItinerary(this,"atp://yariv.trl.ibm.com",new TaskA());
 itinerary.addPlace("atp://tai.trl.ibm.com");
 itinerary.startTrip();
 }
 
 public void run () {
 if (itinerary.atLastDestination()==true) {
 if (lastTask==true) {
 //  completed all tasks.
 }
 else {
 lastTask=true;
 itinerary.setTask(new TaskB());
 itinerary.startTrip();
 }
 }
 }
 

The above code defines an aglet which performs 2-phase computation: in the first phase, the aglet travels among multiple destinations to perform a task defined by TaskA. Then, the second phase is started, in which the aglet visits again all these destinations to perform a task of TaskB.

In the above code, the invocation of itinerary.startTrip() causes the owner aglet to be dispatched sequentially among the destinations. In every destination, the execute() of the corresponding Task object (assigned to the SlaveItinerary object via setTask()) is automatically invoked.

Version:

1.20 $Date: 2001/07/28 06:33:35 $

Author:

Yariv Aridor

See Also:

Serialized Form

Field Summary

private Task

task

Fields inherited from class com.ibm.agletx.util.SeqItinerary

aglet, currentTarget, serialVersionUID

Constructor Summary

SlaveItinerary(Aglet aglet, java.lang.String address, Task task)
Constructor.

SlaveItinerary(Aglet aglet, java.util.Vector addresses, Task task)
Constructor.

Method Summary

void	addPlan(java.lang.String address) Add a new address to the itinerary of the owner aglet
Task	getTask() Return the current task to be preformed by the owner aglet
void	setTask(Task task) Set the task to be preformed by the owner aglet

Methods inherited from class com.ibm.agletx.util.SeqItinerary

addAddress, addresses, addTask, atLastDestination, clear, getAddressAt, getCurrentAddress, getCurrentTask, getOrigin, getOwnerAglet, getTaskAt, goToNext, handleException, handleTripException, incIndex, indexOf, indexOf, isRepeat, onArrival, onTermination, removeTaskAt, setRepeat, size, startTrip

Methods inherited from class com.ibm.aglet.event.MobilityAdapter

onDispatching, onReverting

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

task

private Task task

Constructor Detail

SlaveItinerary

public SlaveItinerary(Aglet aglet,
                      java.lang.String address,
                      Task task)

Constructor.

Parameters:

aglet - the owner aglet

task - the task to preform

address - an address where the task should be preformed

SlaveItinerary

public SlaveItinerary(Aglet aglet,
                      java.util.Vector addresses,
                      Task task)

Constructor.

Parameters:

aglet - the owner aglet

task - the task to preform

addresses - a vector of address where the task should be performed.

Method Detail

addPlan

public void addPlan(java.lang.String address)

Add a new address to the itinerary of the owner aglet

getTask

public Task getTask()

Return the current task to be preformed by the owner aglet

setTask

public void setTask(Task task)

Set the task to be preformed by the owner aglet